Hello people, As some of you know, I would like to start "thinking" in objects. So, I am trying to study some patterns. I've actually ordered a book (suggested in this list!). However... well, you know :-) I am having a bit of a problem understanding the Abstract Session Pattern. http://rubygarden.org/ruby/ruby?AbstractSessionPattern Does anybody here know WHY and HOW you'd use it? Here is the email I sent to the author of the document above - unfortunately, I never got an answer. I assume he must get a lot of emails like this :-| Any ideas? Merc. Begin forwarded message:
on 2006-02-22 15:39
on 2006-02-22 16:51
Tony M. wrote: > Hello people, > > As some of you know, I would like to start "thinking" in objects. So, I > am trying to study some patterns. Patterns may make little sense if you've no experience with OO. Simply knowing a pattern isn't enough to help you determine appropriate use. Consider looking at Designing Object-Oriented Software, by Rebecca Wirfs-Brock Agile Software Development, by Robert C. Martin -- James B. "A principle or axiom is of no value without the rules for applying it." - Len Bullard
on 2006-02-22 18:54
Hi, OK thanks James! (The list of book I have to read is getting dangerously long...!) Merc.
on 2006-02-22 22:34
Well, the thing is that the AbstractSessionPattern in Ruby looks suspiciously like a Factory pattern. The Server is customizing instances of Session objects which it is returning. It's probablly a fair bit different looking for statically typed languages. OO thinking isn't going to come through reading patterns. Patterns help you recognize how and where you can apply a solution that's already been vetted when you're designing/coding. Thinking in terms of Objects will come very naturally as you gain more experience. On the other hand, you might find it a little easier if you thought of Objects as Actors instead (that might get confusing though since Actor systems are closely related and a little different than Object systems). I personally think that by focusing on what an Object can do and how it behaves in a system and sort of putting what it stores on the backburner (until you need to think about it).
on 2006-02-22 22:37
Yeah, I didn't finish my sentence there, d'oh (need a way to edit mailing list messages). I personally think that by focusing on what an Object can do and how it behaves in a system and sort of putting what it stores on the backburner (until you need to think about it) can help make it easier to think about programming in an Object Oriented style.